154640549 has 4 divisors (see below), whose sum is σ = 176732064. Its totient is φ = 132549036.

The previous prime is 154640543. The next prime is 154640567. The reversal of 154640549 is 945046451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 945046451 = 19441 ⋅48611.

It is a cyclic number.

It is not a de Polignac number, because 154640549 - 2¹² = 154636453 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154640543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11045747 + ... + 11045760.

It is an arithmetic number, because the mean of its divisors is an integer number (44183016).

Almost surely, 2^154640549 is an apocalyptic number.

It is an amenable number.

154640549 is a deficient number, since it is larger than the sum of its proper divisors (22091515).

154640549 is an equidigital number, since it uses as much as digits as its factorization.

154640549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22091514.

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 154640549 is about 12435.4553193681. The cubic root of 154640549 is about 536.7529758867.

The spelling of 154640549 in words is "one hundred fifty-four million, six hundred forty thousand, five hundred forty-nine".